<article id="wikiArticle">
<div> <div class="blockIndicator deprecated deprecatedHeader">
<p><strong><span class="icon-only-inline" title="This is an obsolete API and is no longer guaranteed to work."><i class="icon-trash"> </i></span> 已废弃</strong><br/>该特性已经从 Web 标准中删除，虽然一些浏览器目前仍然支持它，但也许会在未来的某个时间停止支持，请尽量不要使用该特性。</p>
</div></div>
<p>The <strong><code>fontsize()</code></strong> method creates a <a href="/zh-CN/docs/Web/HTML/Element/font" title="HTML Font 元素（&lt;font&gt;）定义了该内容的字体大小、顏色与表现。"><code>&lt;font&gt;</code></a> HTML element that causes a string to be displayed in the specified font size.</p>
<div class="note">
<p><strong>Usage note:</strong> The &lt;font&gt; element has been removed in <a href="/en-US/docs/Web/Guide/HTML/HTML5">HTML5</a> and shouldn't be used anymore. Instead web developers should use <a href="/en-US/docs/Web/CSS">CSS</a> properties.</p>
</div>
<h2 id="语法">语法</h2>
<pre><code class="language-javascript"><code><var>str</var>.fontsize(<var>size</var>)</code></code></pre>
<h3 id="参数">参数</h3>
<dl>
<dt><code>size</code></dt>
<dd>An integer between 1 and 7, a string representing a signed integer between 1 and 7.</dd>
</dl>
<h3 id="返回值">返回值</h3>
<p>A string containing a <a href="/zh-CN/docs/Web/HTML/Element/font" title="HTML Font 元素（&lt;font&gt;）定义了该内容的字体大小、顏色与表现。"><code>&lt;font&gt;</code></a> HTML element.</p>
<h2 id="描述">描述</h2>
<p>When you specify size as an integer, you set the font size of <code>str</code> to one of the 7 defined sizes. When you specify <code>size</code> as a string such as "-2", you adjust the font size of <code>str</code> relative to the size set in the <a href="/zh-CN/docs/Web/HTML/Element/basefont" title="HTML标签用来设置文档的默认字体大小。使用&lt;font&gt;可以相对于默认字体大小进行变化。"><code>&lt;basefont&gt;</code></a> tag.</p>
<h2 id="示例">示例</h2>
<h3 id="使用fontsize()方法"><code><font face="Open Sans, Arial, sans-serif">使用</font>fontsize()方法</code></h3>
<p>The following example uses string methods to change the size of a string:</p>
<pre><code  class="language-javascript">var worldString = 'Hello, world';

console.log(worldString.small());     // &lt;small&gt;Hello, world&lt;/small&gt;
console.log(worldString.big());       // &lt;big&gt;Hello, world&lt;/big&gt;
console.log(worldString.fontsize(7)); // &lt;font size="7"&gt;Hello, world&lt;/fontsize&gt;
</code></pre>
<p>With the <a href="/zh-CN/docs/Web/API/HTMLElement/style" title="HTMLElement.style 属性返回一个 CSSStyleDeclaration 对象，表示元素的 内联style 属性（attribute），但忽略任何样式表应用的属性。 通过 style 可以访问的 CSS 属性列表，可以查看 CSS Properties Reference。"><code>element.style</code></a> object you can get the element's <code>style</code> attribute and manipulate it more generically, for example:</p>
<pre><code  class="language-javascript">document.getElementById('yourElemId').style.fontSize = '0.7em';
</code></pre>
<h2 id="规范">规范</h2>
<table class="standard-table">
<tbody>
<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
<th scope="col">Comment</th>
</tr>
<tr>
<td><a class="external" href="https://www.ecma-international.org/ecma-262/6.0/#sec-string.prototype.fontsize" hreflang="en" lang="en" rel="noopener">ECMAScript 2015 (6th Edition, ECMA-262)<br/><small lang="zh-CN">String.prototype.fontsize</small></a></td>
<td><span class="spec-Standard">Standard</span></td>
<td>Initial definition. Implemented in JavaScript 1.0. Defined in the (normative) Annex B for Additional ECMAScript Features for Web Browsers.</td>
</tr>
<tr>
<td><a class="external" href="https://tc39.github.io/ecma262/#sec-string.prototype.fontsize" hreflang="en" lang="en" rel="noopener">ECMAScript Latest Draft (ECMA-262)<br/><small lang="zh-CN">String.prototype.fontsize</small></a></td>
<td><span class="spec-Draft">Draft</span></td>
<td>Defined in the (normative) Annex B for Additional ECMAScript Features for Web Browsers.</td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
<div><div class="blockIndicator warning"><strong><a class="external" href="https://github.com/mdn/browser-compat-data" rel="noopener">We're converting our compatibility data into a machine-readable JSON format</a></strong>.
            This compatibility table still uses the old format,
            because we haven't yet converted the data it contains.
            <strong><a class="new" href="/zh-CN/docs/MDN/Contribute/Structures/Compatibility_tables" rel="nofollow">Find out how you can help!</a></strong></div>
<div class="htab">
<a id="AutoCompatibilityTable" name="AutoCompatibilityTable"></a>
<ul>
<li class="selected"><a>Desktop</a></li>
<li><a>Mobile</a></li>
</ul>
</div></div>
<div id="compat-desktop">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Chrome</th>
<th>Firefox (Gecko)</th>
<th>Internet Explorer</th>
<th>Opera</th>
<th>Safari</th>
</tr>
<tr>
<td>Basic support</td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td>1.0 (1.7 or earlier)</td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
</tr>
</tbody>
</table>
</div>
<div id="compat-mobile">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Android</th>
<th>Chrome for Android</th>
<th>Firefox Mobile (Gecko)</th>
<th>IE Mobile</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
</tr>
<tr>
<td>Basic support</td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td>1.0 (1.0)</td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
</tr>
</tbody>
</table>
</div>
<h2 id="相关链接">相关链接</h2>
<ul>
<li><a href="Reference/Global_Objects/String/big" title="big()方法的作用是创建一个使字符串显示大号字体的&lt;big&gt;标签。"><code>String.prototype.big()</code></a></li>
<li><a href="Reference/Global_Objects/String/small" title="small() 方法的作用是创建一个使字符串显示小号字体的 &lt;small&gt; 标签。"><code>String.prototype.small()</code></a></li>
</ul>
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